diff --git a/.envrc.sample b/.envrc.sample
index 964bc7c..e079ed0 100644
--- a/.envrc.sample
+++ b/.envrc.sample
@@ -9,6 +9,8 @@ export DB_ROOT_PASSWORD_VERSION=v1
 export DB_PASSWORD_VERSION=v1
 export ADMIN_PASSWORD_VERSION=v1
 
+export EXTRA_VOLUME=/dev/null:/tmp/.dummy
+
 ## SMTP settings
 #export COMPOSE_FILE="compose.yml:compose.mailrelay.yml"
 #export SMTP_HOST="postfix_relay_app"
diff --git a/compose.yml b/compose.yml
index 4e50c90..cb88b93 100644
--- a/compose.yml
+++ b/compose.yml
@@ -29,6 +29,7 @@ services:
       - nextapps:/var/www/html/custom_apps:cached
       - nextdata:/var/www/html/data:cached
       - nextconfig:/var/www/html/config:cached
+      - ${EXTRA_VOLUME}
     networks:
       - proxy
       - internal